THUMB RULE FOR CIVIL ENGINEERS
Thumb rule for estimating the Concrete Volume with respect to the area:
The volume of concrete required = 0.038 m3/square feet area
Example:-
lf Plan Area = 40 x 20 = 800 Sq. m.
So, for the plan area of 800 Sq. m.
volume of concrete required= 800 x 0.038m3 = 30.4m3
Thumb rule for Steel quantity required for Slab, Beams, Footings & Columns:
Steel required in residential buildings = 4.5 Kgs - 4.75 Kgs / Sq. Ft.
Steel required for Commercial buildings = 5.0 Kgs-5.50 Kgs/Sq. Ft.
Thumb Rules For Civil Engineers to estimate the Shuttering area:
Shuttering costs is taken as 15-18% of the total construction of the building. Shuttering work is done to bring the concrete in Shape. Thumb rule to estimate the shuttering required is 6 times the quantity of concrete or 2.4 times of Plinth area.
The following recommendations Thumb Rules For Civil Engineers are given in B N Data for the Steel quantity used in different members of the building Percentage of Steel in Structural Members:
1) Slab - 1% of the total volume of concrete
2) Beam - 2% of the total volume of concrete
3) Column - 2.5% of total volume of concrete
4) Footings - 0.8% of the total volume of concrete
Thumb rule used for Cement, Sand, Coarse Aggregate Quantity in Different grades of Concrete :
Note: 1 bag of cement = 50Kgs
Thumb rule for Cement required in Brickwork, Cement Masonry & Plastering work in construction:
Thumb Rules For Civil Engineers for Brickwork:
| Brickwork for 1m3 | Cement Qty in m3 | Cement Qty in Bags |
| 230 mm Brickwork | 0.876m3 | 25.4 Bags |
| 115 mm Brickwork | 0.218m3 | 6.32 Bags |
Thumb Rules For Civil Engineers for Cement Masonry Quantity:
| Cement Masonry Type & Mix | Cement Qty in Bags | Cement Qty in Kgs |
| 200mm in Cement Masonry work of ratio 1:6 | 0.124Bags/m2 | 6.2Kgs/m2 |
| 150mm in Cement Masonry work of ratio 1:6 | 0.093Bags/m2 | 4.65Kgs/m2 |
| 200mm in Cement Masonry work of ratio 1:4 | 0.206Bags/m2 | 10.3Kgs/m2 |
| 150mm in Cement Masonry work of ratio 1:4 | 0.144Bags/m2 | 7.2Kgs/m2 |
| 100mm in Cement Masonry work of ratio 1:4 | 0.103Bags/m2 | 5.15Kgs/m2 |
Thumb Rules Plastering Quantity :
| Type of Plastering | Cement Qty in Bags | Cement Qty in Kgs |
| Rough Plastering | 0.09 Bags/m2 | 4. 5Kgs/m2 |
| Internal Wall Plastering | 0.09 Bags/m2 | 4.5 Kgs/m2 |
| Duct Plastering | 0.09 Bags/m2 | 4.5 Kgs/m2 |
| External Wall plastering | 0.175 Bags/m2 | 8.75 Kgs/m2 |
| Stucco Plastering | 0.175 Bags/m2 | 8.75 Kgs/m2 |
| Lathen Plastering | 0.55 Bags/m2 | 27.5 Kgs/m2 |